Make IAM server cert chains non-mandatory
Make IAM server cert chains non-mandatory

Fixes TOOLS-452

vasiliykochergin/euca2ools,jhajek/euca2ools,gholms/euca2ools,jhajek/euca2ools,nagyistoce/euca2ools,vasiliykochergin/euca2ools,nagyistoce/euca2ools,gholms/euca2ools